D = dict(
    x1=[0, 1, 2, 3, 4, 5],
    y1=[10, 20, 50, 80, 100, 200],
    x2=[0, 1, 2, 3, 4, 5, 6],
    y2=[1, 4, 8, 16, 32, 64, 128],
)
